Radius wheel dresser



Juin 12, 1945.

A. GREIG RADIUS WHEEL DREssER Filed July 29, 1944 3 Sheets-Sheet 1 INVEN TOR.

Arf/wr Gre/'g 310ML/ 'I June 12, 1945. A, GREG f 2,377,934

RADIUS WHEEL DRES SER Filed July 29," 1944 3 Sheets-Sheet 2 vm @E l@i579 His A orne] June l2, 1945,. A. GREIG A 2,377,934

RADIUS WHEELI DREssER I A AFiled Ju1y'29, 1944 :s sheets-sheet sINVENTOR. Arf/7 lr-nl Grellg BY Patented June 12, 1945 RADIUS WHEELDREssEa l Arthur Greig, River Rouge, Mich., assignor to U. S Tool andMfg. Co., a corporation of Michigan Application July 2i), 1944, SerialNo. 547,195

5 Claims. (Cl. 125-11) My invention pertains to dressers for dressingabrasive wheels-for precision grinding and more particularly to radiusand angle dressers.

It is an object'of my invention to provide an improved wheel dresserwhich is more convenient, accurate and reliable for dressing abrasiveWheels for precision grinding.

It is also an object of my invention to provide an improved anglecorrecting radius wheell dresser, and method of operation.

It is a vfurther object of my invention to provide an abrasive wheeldresser which not only does the work of an ordinary radius dresser but'which may also be utilizedfor grindingcompound and compound complexforms on flat form tools andthe like.

Further objects and advantages are within the scope of the invention,such as relate to the cured rigidly on the other end, as by means of ascrew 22 and a key 23. The aperture in the bodyis provided with enlargedcounter-bores 25 and 2'I`in the opposite ends for snugly receiving theouter rings of two tapered roller bearings 3i disposed in opposingrelation for rotatively supporting the main shaft whereupon the in nerbearing rings are snugly disposed. `The intermediate portion of theshaft whichireceives the inner race rings of the roller bearings is ofreduced diameter providing |a shoulder near the arrangement,operation'and function of the related elements of the structure, tovarious details of construction and to combinations of parts,

elements per se, and to economies ofinaufacture and numerous otherfeatures as will be apparent from a consideration oi' the specificationin conjunction with the drawings disclosing specific embodiments of theinvention, in which:

Fig. 1 is a, side elevational view showing my improved angle correctingradius wheel dresser;

the nd of the crank with the diamond Edresser element therein;

Fig. 6 is an end elevational view,`partially dicrank end which rmlyabuts the outer end of the inner ring of theadjacent tapered rollerbearing. The other end of the reduced portion of the main shaft isthreaded for receiving a nut 33 thereon lrmly abutting the outer end ofthe inner ring' of the other roller bearing which is disposed in anopposing relation to the .bearing adjacent the crank. The nut 33 may besecured in any well known manner, as by a lock-washer for example.'

The end of the body II adjacent the crank end of the shaft is closed andsealed around the shaft by means of a closure ring 35 'secured to thebody, as by screws 37, and having a sealing glandsealed by any suitableshaft sealing ring 39, of which a suitable well known type isrepresented, comprising a leather collar 3B clamped around on the shaftI5 by a spring 4|) and'enclosed in an annular sheet metal ring 42 asshown in detail Fig.

The counter-bore in the other end of lthe body is longer in order toprovide ample space for the bearing securing nut 33 anda secondcloagrammatic and broken away, illustrating the use of the dresser;

Figs. '1 and 8 are 'diagrammatic views illustrating positions in whichthe dresser may engage a wheelto be dressed;

Fig. 9 is a plan view showing a position in which substantiallycylindrical body I I having a. bearing aperture I3 extending axiallytherethrough. V.A main shaft I5, having a curved radius crank I1extending rigidly from one end, passes through the axial aperturethrough the body and has a convenient adjusting handle i9 and hub 2|sethe dresser maybe used for dressing for combetween the second closurering 4I and the hub 2| and this ring is rigidly secured to rotate withthe shaft. as by means of the same key 23 which also secured the hub tothe shaft. The ring 43 is plovided with an indicator finger M whichprojects adjacent the second closure ring which is provided with asuitable scale 45 for showing the various angular positions to which themain shaft ls is adjusted ni the body. The mam shaft v may be adjustedthrough any desired angle up to a substantial angle of about 40 and itis limited to lanydesired angular swing by means of a pair of stopscrewsl which may be moved, to

various positions as represented dotted in Fig. 2,

and clamped in a T-slot 49 in the closure ring 4I so as to engageopposite sides of the indicator finger 4'4, as the handle I9 isoscillated from sideto-side.

The end of the curved radius crank I1 is provided with a radiallydirected aperture 5I wherein a Wheel dresser member 53 is slidablydisposed. In the end ofthe crank I1 is a screw 55 having a knurled knob51 for conveniently securing the dresser element 53 in any positionaccording to the radius desired. To facilitate this adjustment, a radiusdetermining measuring arm 59, having an L shaped head 6I, is provided.This may be inserted into a bushing 60 disposed in a radial aperture inthe end of the crank to insure that the wheel dresser member 53 may bequickly and accurately positioned when moved radially, as indicated indotted lines in Fig. 1. A

suitable thickness gauge 62 may be inserted between the point of thewheel dresser 53 and the head 6I. Also the member 6I may be movedradially and secured in various positions, as rep- .resented dotted, bymeans of a knurled screvtr 63.

The body II in which the main shaft is supported, and wherein it may beadjusted on an axis designated as the main axis, is in turn adjustablysupported for adjustable angular rotation on an auxiliary axis which isat right angles to said main axis. As shown in Fig. 2, and morespecically in Fig. 4, this is accomplished by mounting the body II uponthe inner end of an auxiliary shaft 65 which passes through anupstanding wall 61 rising from one edge of a pedestal flange 69. Openingthrough the side wall of the body at right angles to the axis of themain shaft I5 is an aperture wherein one end of the auxiliary shaft 65is inserted and secured. as by keys 1I. The other end of the auxiliaryshaft A55 projects through to the other or outer side of the wall 61 andit is threaded for receiving a hub 13 and a handle 15 whereby toconveniently control the adjustment of the body angularly on theauxiliary axis. The outer side of the wall is provided with an annularsocket 11 concentric with the shaft 65 4for receiving the adjacent endof the hub 13 when it is screwed upon the end of the auxiliary shaft. Awasher 19 is provided on the shaft between the hub and the bottom of thesocket. The hub 13 is provided with an aperture 8| which opens from theinner end of the hub and which is of a suitable diameter for receiving acompressed spring 83.

The inner side of the wall 61 engaging the body II thereon,l and theadjacent portion of the so that by drawing the auxiliary shaft 65 firmlyin the wall by means of the hub 13 screwed thereon, the body is rigidlysupported from the wall for very accurate angular rotation or adjustmenton the auxiliary axis. Also, for this purpose, the base of the bearingprojection 85 is preferably provided with an annular groove forreceiving an intertting annular flange 89 projecting therein from theouter edge of the tapered socket in the body. As Fig. 2 shows', a

calibrated scale 9I is provided on the portion of the body which engagesthe bearing projection for cooperation with an index mark 93 on thelatter, or the relation of these may be reversed as by placing the scaleon the stationary part and the index mark on the adjustable body, aswill be understood. In this manner accurate positioning and movement ofthe body- II are assured and the adjusted angular position of the bo-dyon the auxiliary axis is readily determined.

In operation, if it is desired to make a convex cutting face on theabrasive Wheel 95, represented in Fig. 7, the diamond point of thedresser element 53 is positioned under the center of the wheel.Initially the radial position of the dresser element in the crank I1 isset below the axis of the shaft I5 by a distance equal to the radius tobe dressed on the wheel. As shown in Fig. 6, the pedestal of the dresserusually sets upon the chuck 91 of the grinder machine, against theparallel bar 99. For a convex surface on the wheel, which is a circulararc incross-section, the axis of the shaft I5 is set at zero angle, orparallel, to the horizontal or chuck 95, as represented in Fig. '7, andwith the point of the diamond engaging the wheel below its center, thehandle I9 is oscillated to move the point across the face of therotating wheel.

But when dressing a wheel for forming a groove IIJI in a flat form tool|03, shown in Fig. 10, having an angle B, it is necessary to considerthat the cross-section of the groove where it intersects the angularsurface will be substantially different. If it is desired, for example,to have a circular cross-section where the groove IUI intersects theangular surface, the axis of the shaft I5 must be inclined at a similarangle B to the chuck to make a modified convex surface on the face ofthe wheel. The wheel will then form a groove I llI of a properlyfconformed cross-section sothat it will have the desired, circular, orother desired shape where it intersects on the angular surface. For acompound-complex angle, as where'there is also another faceintersecting, the angle of the pedestal of the dresser is then inclinedaway from the parallel bar 99 using the front right corner as the pivotpoint, to the directly read angle that is called for (as thisinformation may be provided on the blue-print) as represented in Fig. 9.requirements for various compound-complex angles can be convenientlymet. For dressing a concave surface in the face of a wheel, the'diamondpoint 53 is set above the axis of rotation of shaft I5 by an amountequal to the radius of curvature desired, and the dresser. is utilizedin the manner previously described.

This accurate, direct reading dresser obviates the costly labo-r wastingpractice used in the old style hit-and-miss method of dressing radii byguessing where and how much back of center of the wheel the commondresser should be placed in order to prod ce the right radius.

It is apparent t at within the scope of my invention modifications anddifferent arrangements.

may be made other than hereindisclosed, and the present disclosure isillustrative merely, the invention comprehending variations thereof.

I claim:

1. A radius and angle wheel dresser comprising, a base having a pedestalflange with an upstanding wall rising from along one edge thereof, abearing projection projecting from the inner side of said wall andextending over the pedestal flange, said bearing projection having acircular cross-section, a bearing aperture passing through said wall andconcentrically through said bearing projection, a body having a bearingaperture In this manner the l shaft projected through to the outer sideof said wall being threaded, adjusting means secured upon the outer endof said auxiliary shaft, a main shaft `iiassing rotatively through thebearing aperture in said body, a radius crank extending rigidly from oneend of said main shaft, a wheel dresser member extending movable radial-Lv through the crank for convenient adjustment toward or away from theaxis of said main shaft,

means for securing said wheel dresser element in any adjusted radialposition in said crank, manual means secured upon the other' end of saidmain shaft for rotating the main shaft and wheel dresser to variousdesired positions, cooperative calibrated scale andV index means forshowing the angular 'position of the main shaft relative to the body,and calibrated scale and index means cooperatively on said wall bearingprojection and body for showing the angular position of the bodyrelative to said wall as adjusted upon the auxiliary axis.

2. In combination in a radius and angle wheel dresser, a base having apedestal flange with an upstanding wall rising along one edge thereof, abearing projection extending from the inner side of said wall over saidpedesdal flange, said bearing projection being circular incross-section, a bearing aperture passing through said wall andconcentrically through said bearing projection, a substantiallycylindrical body having abearing aperture extending axially therethroughand an auxiliary aperture opening through the side wall of said bodyperpendicularly to the main axis of the body, the outer portion of saidbody around the outer end of said auxiliary aperture` and adjacent theend of said bearing projection being suitably conformed for cooperativeinteriitting engagement therewith. an auxiliary shaft having` one endsecured into said auxiliary aperture in said body and passing rotativelythrough the said wall as adjusted upon the auxiliary axis, and closuremeans for closing and sealing around the end of said main shaft andbody.

3. In a radius and angle wheel dresser the combination in accordancewith claim 1 and further characterized by having a pair of taperedroller bearings spaced apart in opposing relations in said body forrotatively supporting said main shaft. and stop means for stopping saidmain shaft in any adjusted angular position.

4. A radius and angle wheel dresser in accordance with claim 2 andfurther characterized by having aY T-slot opening 'from said secondclosure ring and extending curved around the axis of said main shaft,and a pair of stop screws adjustable in said T-slot to stop said mainshaft in any adjusted position. and said index means being secured toand projectingfrom said main shaft over said Tslot.

5. In a radius and angle wheel dresser the coml bination of, a basehaving a pedestal flange with an upstanding wall rising from along oneedge thereof, a bearing projection projecting from the inner side ofsaid wall and extending over the pedestal flange, said bearingprojection having a circular cross-section, a bearing aperture passingthrough said wall and concentrically through said bearing projection, asubstantially cylindrical body having a bearing aperture extendingaxially therethrough, and an: auxiliary aperture opening through theside wall of said body per- 4 pendicularly to the main axis of the body,the

bearing aperture in said bearing projectionof member extending radiallythrough'the crank for convenient adjustment toward or away from the axisof said main shaft, means nrmly securing`exmeansforshowingtheangularpositionofthemainshaftrelativetothebody,andcaii Vscale and index meanscooperatively on wall bearing projection and body forshowthesngularpositionofthebodyrelativeto outer portion of said bodyaround the outerend of said auxiliary pertllre and the end of saidbearing projectio being suitably conformed for cooperative inte tingengagement, an auxiliary shaft having one end secured into saidauxiliary aperture in said body and passing rotatively through thebearing. aperture in said bearing projection of said wall, the end ofsaid shaft projected through to the outer side of said wall beingthreaded, rotative means threadably secured upon the threaded end ofsaid shaft, a main shaft passing rotatively through the axial aperturein said body, a pair of taper roller bearings disposed spaced apart inopposing relations for rotatively supporting said main shaft in saidbody, a radius crank extending rigidly from one end of said main shaft,said crank being adapted for radially supporting a dresser element forconvenient adjustment toward or away from the axis of said main shaft,means for rmlysecuring a wheel dresser element in any adjusted positionin said crank, manual means secured upon the lsealing around the end ofthe main shaft adjacent the manual adjusting end of the main shaft, aT-slot curved concentricaliy of said shaft insaidsecondclosurerinmlockingscrewsjnsaid .T-sl'ot, andl an' indicatingpointer on said m'ain shaft and extending 'radially adjacent said sec- 4.ond closureringfors'howingtneangularpositionofsaidshaftinsaidbodyandforengagementbetweensaidlockingserewsforsecuringthe main shaft.

i AR'I'BUB GREG.

